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The 21-year-old holds Mexican/German dual nationality so would not need a work permit to complete a move and Fassi believes progress on a deal is imminent.

"Yes, there is interest but we have to see how much they are interested," Fassi told Medio Tiempo.

"In principle we have a sporting plan for Jurgen and we hope he stays, but if something comes up from abroad, we have to take it into account and if it's serious, we have to respond, we will have news in the next 48 hours."

Fassi confirmed the club interested is Jose Mourinho's Chelsea and claims representatives from Stamford Bridge could be in Mexico as soon as Thursday to open discussions.

"Chelsea are the club interested, but we have to see how much they are interested, we can't go ahead of ourselves, we have to wait and see," he added.

"When it comes to us, it's a matter of sporting project. We want him to stay and we will see how much Chelsea are interested.

"There is a belief they arrive in Mexico on Thursday to talk with us."